21517461

素因数分解:

$3^3\times 7^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{181}}^1$

素因数の和:251

約数の個数: 64

約数和(自身を含む): 39836160

約数和(自身を除く): 18318699

約数列:

[1, 3, 7, 9, 17, 21, 27, 37, 51, 63, 111, 119, 153, 181, 189, 259, 333, 357, 459, 543, 629, 777, 999, 1071, 1267, 1629, 1887, 2331, 3077, 3213, 3801, 4403, 4887, 5661, 6697, 6993, 9231, 11403, 13209, 16983, 20091, 21539, 27693, 34209, 39627, 46879, 60273, 64617, 83079, 113849, 118881, 140637, 180819, 193851, 341547, 421911, 581553, 796943, 1024641, 1265733, 2390829, 3073923, 7172487, 21517461]

約数ペア:

[(1, 21517461), (3, 7172487), (7, 3073923), (9, 2390829), (17, 1265733), (21, 1024641), (27, 796943), (37, 581553), (51, 421911), (63, 341547), (111, 193851), (119, 180819), (153, 140637), (181, 118881), (189, 113849), (259, 83079), (333, 64617), (357, 60273), (459, 46879), (543, 39627), (629, 34209), (777, 27693), (999, 21539), (1071, 20091), (1267, 16983), (1629, 13209), (1887, 11403), (2331, 9231), (3077, 6993), (3213, 6697), (3801, 5661), (4403, 4887)]